Connection Of The Three-Phase Current Motor - Wilo Rexa PRO Serie Instrucciones De Instalación Y Funcionamiento

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6.5.2.1 Checking insulation resistance of
the motor winding
6.5.2.2 Checking resistor in the tempera-
ture sensor
6.5.2.3 Testing the resistor of the exter-
nal electrode for sealing chamber
control
6.5.3 Connection of the single-phase
AC motor
PE N L
C
r
M 1~
Fig. 8: Connection diagram of the single-phase
AC motor
6.5.4 Connection of the three-phase
current motor
26
Installation and electrical connection
In case of failure contact customer service.
Measure insulation resistance with an insulation tester (measuring voltage = 1000 V). Ad-
here to the following values:
▪ On initial commissioning: insulation resistance may not be less than 20 MΩ.
▪ For further measurements: value must be larger than 2 MΩ.
Check resistor in the temperature sensor with an ohmmeter. The following measured values
must be complied with:
▪ Bimetallic strip: Measured value = 0 Ohm (passage).
▪ PTC sensor (positive temperature coefficient thermistor): Measured value depends on the
number of sensors installed. A PTC sensor has a cold resistance of between 20 and
100 Ohm.
– With three sensors in series, the measured value is between 60 and 300 Ohm.
– With four sensors in series, the measured value is between 80 and 400 Ohm.
Measure the resistor of the electrode with an ohmmeter. The measured value must ap-
proach "infinity". For values ≤ 30 kOhm, there is water in the oil – change the oil!
The single-phase current version is equipped with bare cable ends. Connection to the mains
is established by connecting the power supply cable in the switchgear. Electrical connec-
tion must always be carried out by a qualified electrician!
NOTICE! The individual wires are designated according to the connection diagram. Do
not cut the wires! There is no additional assignment between the wiring diagram and
connection diagram.
20 21 DK
Wire
1, 2
3
4
5
6
Green/yellow (gn-ye)
Technical data for the starting capacitor and operating capacitor
Capacitors must be provided on-site.
▪ Starting capacitor (C
▪ Operating capacitor (C
▪ Operating time of starting capacitor: max. 1 s
The three-phase current version is equipped with bare cable ends. Connection to the mains
is established by connecting the power supply cable in the switchgear. Electrical connec-
tion must always be carried out by a qualified electrician!
For the correct direction of rotation, a clockwise phase sequence must be present.
NOTICE! The individual wires are designated according to the connection diagram. Do
not cut the wires! There is no additional assignment between the wiring diagram and
connection diagram.
Designation
20, 21
U1/Z1
U2
Z2
DK
PE
): 70 µF, 440 V, 60 Hz
S
): 35 µF, 440 V, 60 Hz
R
Terminal
Monitoring the motor wind-
ing
L
N
Start and operating capacitor
connection
Monitoring of motor com-
partment
Ground
WILO SE 2019-02